<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<p th:text="${msg}" style="color: red"></p>
<form th:action="@{/login}">
   用户名: <input type="text" name="username">
   密码:   <input type="text" name="password">
    <input type="submit">
</form>

</body>
</html>